I'm in the midst of a new build and I've got a question about cooling. I have a HAF 912 and I was wondering if the stock fans (a 120mm in front & a 120mm in back--both are 1200 RPM) plus a non-stock CPU cooler (Hyper 212 EVO) on my i5-2500k will provide enough cooling? Or should I add a 200mm or two (like a COOLER MASTER Megaflow 200) to be safe? I'm not planning on overclocking right away.
Here's my build:
CPU: Intel i5 2500k
Motherboard: Gigabyte GA-Z68XP-UD3 LGA 1155 Z68 ATX
Memory: G.SKILL Ripjaws X Series 8GB
Video Card: Gigiabyte Ultra Durable VGA Series GV-R685OC-1GD Radeon HD 6850
Case: HAF 912
HD 500GB 7200 RPM 16MB Cache SATA 6.0Gb/s
Power: Corsair Builder Series 600 Watt ATX 12V Power Supply
Optical Drive: ASUS 24X DVD Burner
Operating System: Windows 7 Home Premium 64-bit
CPU Fan: COOLER MASTER Hyper 212 EVO
The case comes with one front and one rear fan with the option of adding two top and one more front and a side fan so you have plenty of options with that case. The thing with these Cooler Master Half cases is that they have a lot of fan options so that you can really optimize the cooling inside the case. If need be I would add the top fan and another front one that way you will have two in and two out. I wouln't bother with the 200mm and go for the 120's , you can get some high cfm fans that are pretty quiet.
I have the haf 912 and it is perfectly fine with the stock fans, however all i got were 2 antec 3 switch led fans and put them in the front and took the fan originally in the front and put it onto my 212 evo for a push pull setup. Then you can put a fan on the side to intake cool air to cool your gpu and then get a 200mm fan or 2 120mm fans on the top.
If you plan to really OC the processor far, (e.g. past 4.3.Ghz) or CF (I believe that motherboard supports CF) then I would add a fan or two. But you should be just fine. Fans are nice, but to overclock you really want to invest in CPU coolers instead of fans for the most part.